Protein kinase AMP-activated non-catalytic subunit beta-2 (PRKAB2)

Protein kinase AMP-activated non-catalytic subunit beta-2 (PRKAB2) is a regulatory subunit of the AMP-activated protein kinase (AMPK) complex, which acts as a key cellular energy sensor. The AMPK heterotrimer consists of a catalytic alpha subunit and regulatory beta (including PRKAB2) and gamma subunits. Upon cellular energy stress, AMPK is activated, shifting cellular metabolism toward energy-generating processes while inhibiting anabolic pathways such as fatty acid and cholesterol synthesis. The PRKAB2-encoded beta-2 subunit serves as a scaffold crucial for assembly and stabilization of the AMPK complex and contributes to tissue specificity—being highly expressed in skeletal muscle and also implicated in cardiac and neuronal development. PRKAB2 has been functionally associated with various metabolic diseases, cancer, and neurodevelopmental syndromes, and is targeted by drugs that modulate AMPK activity—either directly or indirectly. PRKAB2 is considered a bona fide therapeutic target due to its central role in cellular metabolism and disease.

Other names

5'-AMP-activated protein kinase subunit beta-2AMPK subunit beta-2AMPK beta 2AMPK beta-2 chainAMP-activated protein kinase beta 2 non-catalytic subunit5'-AMP-activated protein kinase, beta-2 subunitProtein kinase, AMP-activated, beta 2 non-catalytic subunit

Activation of the AMPK complex, leading to phosphorylation and inactivation of metabolic enzymes (e.g., ACC, HMGCR), shifting the cell from anabolic to catabolic metabolism and inhibiting cell growth and biosynthetic processes. Regulation of AMPK localization and assembly through post-translational modification of PRKAB2 (e.g., ubiquitination, sumoylation).